This is a great at-home workout to strengthen your core and tone your stomach. Using the couch, or an elevated surface to perform plank variations helps protect your core. Gravity puts downward pressure on the linea alba, the connective tissue between your six pack muscles. This connective tissue often gets weekend from pregnancy , so it is important to train your core the right way once you become a mother. Otherwise, you could be left with a pooch and a weak midsection. You can also do these moves on a counter or a barstool. Be sure to consult with your doctor or pelvic floor physical therapist.